

Side Angle Side PostulateProving Congruent Triangles with SAS The Side Angle Side postulate (often abbreviated as SAS) states that if two sides and the included angle of one triangle are congruent to two sides and the included angle of another triangle, then these two triangles are congruent.
Example 1
The included angle means the angle between two sides. In other words it is the angle 'included between' two sides. Identify Side Angle Side RelationshipsIn which pair of triangles pictured below could you use the Side Angle Side postulate (SAS) to prove the triangles are congruent?
Side Angle Side Practice Proofs
Given: 1) point C is the midpoint of BF 2) AC= CE
Prove that $$ \triangle ABC \cong \triangle $$EFC Side Angle Side Example ProofProve $$ \triangle BCD \cong \triangle BAD $$ Given: HJ is a perpendicular bisector of KI
Side Angle Side Activity
Below is the proof that two triangles are congruent by Side Angle Side. Can you imagine or draw on a piece of paper, two triangles, $$ \triangle BCA \cong \triangle XCY $$ , whose diagram would be consistent with the Side Angle Side proof shown below?
Theorems and Postulates for proving triangles congruent Hypotenuse Leg Theorem  Side Side Side  Side Angle Side  Angle Side Angle  Angle Angle Side isosceles triangle proofsCPCTC  indirect proof quiz on all theorems/postulates  Images Free Math Printable Worksheets: Worksheets & Activities on Triangle Proofs This page: SAS Pracice Proofs included angle  SAS Postulate 